Retaining-valve.



No. 853,906.' PATENTBD MAY14, 1907.

RETAINING VALVE.

APPLIoATloN FILED 11017.12. 1906.

4i/1154.1 1 n; (gu/inflar' Uivrrnn lsmiliesv PATENT orrion.

`MICHAEL SOMERS, OF EAST PITTSBURG, PENNSYLVANIA.

RETAINING-'VALVEJ ivo. 853,906.

' Specification of LettersiPatent.

Patented May 14, 1907.'

y rApplication tiled November 12, 1906. Serial No. 343,030.v

.therein to the accompanying drawing.

This invention relates to retaining valves for air brake systems, and its primary object is to provide effective means for preventing the exhausting of the brake cylinders when the air tank or reservoir is charged.

The construction of the improvement will be fully described hereinafter in connection with the i accompanying drawing, .which forms part of this s eciiication, and its novel features will be elined in the appended claims. l

The drawing represents a central vertical section of the improvement in connectionv with an air reservoir and brake cylinder said reservoir and cylinder as well as the pipe' connections being shown in elevation.

The reference numeral 1 designates the air tank or reservoir and 2 the brake cylinder, the pipe connection 3 between said cylinder and said reservoir being equipped with the usual triple valve 4.

l em loy two valve casings 5 and 6, within each cip which is a piston designated respectively by the numerals 7 and 8 and having peripheral packin 9. Each of the pistons 7 and 8 is centray bored and threaded to receive a threaded stem 10 surrounded by a coil spring 11, the lower ends of said springs encircling sleeves 12 formed at the bottom of each of. said valve casings 5 and 6.

The two casings 5 and 6 are closed by a cover-plate 13 and said cover-plate is provided centrally above the casing 5 with a threaded socket 14 to receive a threaded boss 15 depending from a diaphragm chamber 16 having a port 17 communicating with the casing 5, and a port 18 communicating by a pipe 19 with the air reservoir 1.v

A diaphragm 20 is supported within the chamber 16 upon an annular flange 21, being held thereon by a hollow plug 22 having al threaded collar 23 engaging the upper threaded end of the chamber 16. A needle valve 24 having a head 25 extends through the center of the diaphragm to control the port 17 said valve 24 being secured below the diaphragm by a nut 26 and above' the diaphragm by a guide 27, recessed on its under surface to receive the head and having a pin extension 28 fitting within a hollow stem 29 threaded through the upper end of the plug and held by a jam nut 30. A coil spring 31 surrounds the stem 28 as shown.

The stem 10 within the casin 5 carries a hollow valve 32 iitting a bevele seat 33 below the casing 5, said seat 33 being exteriorly threaded to receive a valve chamber 34 internally threaded for attachment to the seat 33 and formed with a conical valve-seat 35 to receive a spring-pressed valve 36 the stem of which extends into the hollow valve 32. An air passage 37 is arranged below the port 38 in the valve seat 35 and said passage has a pipe connection39 with the brake cylinder pipe 3. The valve chamber 34, is connected by a port 40 and pi e 41 with a port. 42

formed in the cover-p ate 13 above the casing 6.

To a threaded sleeve 43 depending from the casing 6 is attached a valve chamber v44 having a seat 45 for a beveled valve 46 controlling a port 47 in the seat 45. 'An air passage 48 below the valve seat 45 communicates through a port 49, and a pipe 5() with the triple valve 4. An exhaust pipe 51 connects with a port 52 in the valve4 chamber 44 and an exhaust port 53 is formed in one side of the valve seat 33.

When air is discharged from the train pipe the triple piston drops and establishes connection between the reservoir 1 and the cylinder 2. Air passes through the pipe 39` and port 38 to the port 40 and pi e 41 to the upper side of the piston 8 and t is closes the exhaust ports 47 and 52 preventing exhaust from the triple valve.

When the pressure in the reservoir is su'l'licient to raise the piston in the triple valve the exhaust to the cylinder 2 is closed and air passes through the pi e 19 to the space above the piston 7 to close t ie pipe 39 and allow the air above the piston 8 to exhaust through the port 53. The piston 8 then raises and the tri le valve and brake cylinder exhaust throng the port 52. In normal running condition the valve 24 will be closed as will also be the valve 32. The spring 31 is of greater relative tension than the spring 11 in the chamber 5.

IOO

What I claim and desire to secure by Letters Patent7 is l. The combination with the air reservoir, triple Valve and brake cylinder of an air brake, of a double Valve casing, comprising two independent chambers, a piston in each of said chambers, a depending valve chamber belowone of said casings having a pipe connection with the brake cylinder, and a pipe connection with the top of the adjacent casing, oppositely disposed Valves within said depending chamber, a depending valve chamber below the other casing having a pipe connection with the triple valve, and an 'exhaust port7 a Valve controlling said eX- haust, and means for admitting air from the reservoir to one of said casings.

2. The combination with the air reservoir, triple Valve and. brake cylinder of an air brakeJ 'of a double Valve casing comprising two independent chambers7 a piston in each of said chambers, a depending Valve chamber below one of said casings having a pipe connection with the brake cylinder, and a pipe connection with the top of the adjacent casing, oppositcly disposed valves within said depending chamber, a depending valve chamber below the other casing having a pi be connection with the triple valve, and an eX iaust port, a Valve controlling said exhaust, and means for admitting air from the reservoir to one of said casings comprising a diaphragm chamber above said casing7 a diaphragm therein, a pipe connection betnf'ecn thc reservoir and diaphragm chamber, and a Valve extending centrally through said diaphragm controllingl a port connecting said diaphragm chamber with the casing below it.

ln testimony whereof l allx my signature in the presence of two witnesses:

MICHAEL SOMERS. Witnesses Jol-IN T. KELLY, ALEX R. JonNs'roNE. 

